System of electrical operation.



No. 858,632. PATENTED JULY 2, 1907.

J. G. SLAUGHTER.

SYSTEM OF ELECTRICAL OPERATION. APPLIOATION FILED MAY 9, 1903.

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UNITED STATES PATENT OFFICE;

JOEL C. SLAUGHTER, OF DALLAS, TEXAS, ASSIGNOlt 'IO ELECTRICAUTO-TRANSFORMER COMPANY, OF ST. LOUIS, MISSOURI, A OORPORr TION OFMISSOURI.

SYSTEM OF ELECTRICAL OPERATION.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed May 9, 1903. Serial No. 156,861.

To all whom it may concern:

Be it known that I, .ToEL O. SLAUGHTER, a citizen of the United States,residing at Dallas, Dallas county, State of Texas, have invented certainnew and useful Improvements in Systems of Electrical Operation, of whichthe following is a specification containing a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart hereof.

"he drawing is a diagrammatic view of an alternating current generatorsystem showing my invention used in connection therewith.

This invention relates to systems of electrical operation and is adaptedto be utilized particularly in connection with alternating currents.

The object of my invention is to provide a system wherein a saving willbe effected in the power required to operate a generator during reducedloads, thereby reducing the fuel consumption below that which would berequired to operate the systems in use at present. In the presentsystems, wherein a constant voltage is maintained, the magnetic lossesin the generator when operating under a reduced load are practically thesame as when it is supplying its entire capacity.

In my improved system I provide means for decreasing the excitation ofthe generator during reduced loads and thereby reduce the energy wastedthrough magnetic reactions. Decreasing the excitation will also reducethe voltage supply of said generator. To maintain the voltage at thedesired value, I provide a suitable transformer in the generatorcircuit. I also provide means for varying the excitation of thegenerator an d the strength of the transformer simultaneously.

Referring to the drawing which represents the preferred form of myinvention, 1 indicates an alternating current generator, 2 and 3 themain lines leading from the same.

f indicates the generator exciter, 5 and 6 indicate wires connecting theexciter 4 to the alternator field. When the wire 5 is connected to thepositive brush of the exciter the current will pass from the exciter fthrough the wire 5, through the switch 7, into the rheostat 8, thence tothe field of the alternator and return to the exciter through the wire6.

9 indicates the primary coil of a transformer. This coil is ofadjustable value and connected in series on the main line wire 3. 10indicates the secondary coil which is preferably wound on the same corein close proximity to the primary, one end of this secondary coil isconnected to the wire 3 at 12, the other end of said coil beingconnected to the wire 2 by means of a switch 11.

A switch 13 is connected at one end to the main line wire 3, the otherend of said switch being adapted to engage any one of a series ofcontacts 14, connected to different points in the primary coil 9. Iprovide a connection between the switches 7 and 13 to cause them tooperate simultaneously.

The operation of my improved system is as follows: When the generator issupplying its entire capacity the switch 7 engages the rheostat contactat the extreme left, thereby removing the resistance of the rheostat Sfrom the exciter circuit, the switch 13 engages the contact 14 at theextreme right, thus permitting the entire generator supply to bedelivered to the translating devices without going through theadjustable primary coil 9, and if desired the switch If may be open.When the generator is operating under reduced loads, the switch 11 isclosed. The switches 7 and 13 are adjusted simultaneously to decreasethe field excitation and maintain a predetermined voltage in thegenerator circuit, i. c. the switch 7 is adjusted to introduce a certainamount of resistance into the exciter circuit, thereby reducing theexcitation of the generator, hence reducing its magnetic losses. Thegenerator will now supply a reduced voltage but it will be understoodthat the switch 13 moved in unison with the switch 7 and placed aportion of the primary coil into the generator circuit, therebyincreasing the voltage supplied by said generator.

I am aware that minor changes in the construction, arrangement andcombination of the several parts of my system can be made andsubstituted for those herein shown and described without in the leastdeparting from the nature and principle of my invention.

I claim:

1. In a system of electrical operation, means for vary- 7 ing the fieldstrength of an alternating current generator, adapted to decrease theenergy wasted by said generator (luring reduced loads, cooperating withmeans for main taining a predetermined voltage on a circuit supplied bythe generator; substantially as described.

2. In a system or electrical operation, means for varying the fieldstrength'of an alternating current generator, co-operating with atransformer located in circuit with the generator, to increase theeiliciency of said generator during reduced lozids; substantially asdescribed.

35. in a system of electrical operation of the character described, aseries of coils so arranged as to be brought into play and maintain theline voltage at any desired constant figure. while the generator voltagecan be low cred so as to permit operation at better economy, and meansfor disconnecting the coils and allowing the generator to feed directlyinto the line when the load becomes such that the use of the coils nolonger effects said economy, substantially as specified.

4. In a system of electrical operation of the character described, agenerator. :1 se s of coils so constituted as to effect: a variablevoltage aising or lowering apparatus which keeps the line voltageconstant at any desired figure and permits the generator to be operatedat the voltage giving the greatest economy, and means for (liscouucctingsaid voltageraising or lowering device at such times as when it becomesinexpedient to use the same, substantially as specified.

5. In a system of electrical operation, means for reducing the fieldstrength of an alternating current generator during low loads,co-operating with means for increasing the voltage supplied by saidgenerator, for the purpose specified.

6. In a system of electrical operation, means for varying the fieldstrength of an alternating current generator adapted to operate inunison with means for maintaining a predetermined voltage supply,substantially as described.

7. In a system of electrical operation, an alternating currentgenerator, a transformer located in a circuit supplied by saidgenerator, and means for simultaneously varying the field strength ofthe generator and the strength of said transformer, substantially asdescribed.

8. In a system of electrical operation, an alternating currentgenerator, a voltage raising device located in a circuit supplied bysaid generator, and means for simultaneously varying the field strengthof the generator and the strength of said voltage raising device,substantially as described.

1). In a system of electrical operation, an alternating currentgenerator, a transformer having a primary coil of adjustable valuelocated in a circuit supplied by said generator, and means forsimultaneously varying the strength of the generator field and thestrength of said primary coil, for the purpose specified.

10. In a system of electrical operation, an alternating currentgenerator, a transformer having its primary coil connected in series ona circuit supplied by said generator, and its secondary connected inmultiple on said circuit, and means for varying the strength of the generator field adapted to operate in unison with means for varying thestrength of said primary coil, substantially as described.

11. In a system 01 electrical operation, an alternating currentgenerator, means for simultaneously decreasing the generator excitationand increasing the voltage supplied by said generator, substantially asdescribed.

12, In a system oi. electrical operation. a voltage raising devicearranged to raise the voltage supplied by a generator during reducedloads and thereby allow the field excitation to be reduced so as topermit operation at greater economy, and means for disconnecting thevoltage raising device and allowing the generator to feed directly intothe line when the use of said device does not effect an economy,substantially as described.

13. In a system of electrical operation, a transformer arranged to raisethe voltage supplied by a generator during reduced loads and therebyallow the field excitation to be reduced so as to permit operation atgreater economy, and means for disconnecting the transformer andallowing the gencrator to feed directly into the line when the use ofsaid transformer does not effect an economy, substantially as described.

l-i. In a system of electrical operation, a voltage raising deviceco-operating with a device for varying the field excitation of analternating generator to enable said generator to operate economicallyduring reduced loads, and means for eliminating said devices when theydo not effect an economy, substantially as described.

In testimony whereof, I have signed my name to this specification, inpresence olf two subscribing witnesses.

JOEL C. SLAUGHTER.

Witnesses M. G. IItION, Autumn A. Burns.

